PayPal, one of the largest fintech and online payment system leaders, has used Node JS in production almost since the very start. The fact is that they were using Java for the backend at first (just like Netflix did), but then PayPal adopted Node JS for their backend.
LinkedIn has over 60 million unique users using its mobile applications. The company needed a performing technological solution to perform at such a scale. LinkedIn used Rails for its mobile site, but it was too slow and poorly scalable. LinkedIn switched to NodeJS to solve its scaling problems. The company appreciated two advantages: the scale and the way Node communicates with its platform API and database.
Instagram has entirely used the ReactJS library. A vast number of its features, such as for loading, Geolocations, Google Maps, image, video delivery, uploading, etc., are implemented due to ReactJS.
It based its tech stack on Java, but a few years ago, it switched to NodeJS to handle an issue with a specific service that Java could not take. So they migrated their entire user face stack to NodeJS. Its developers say that moving to Node.js was a big time saver for the global marketplace.
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